Cooling device for the cylinders of internal-combustion engines



Nov. 20, 1928.

F. H. ROYCE COOLING DEVICE FOR THE CYLINDERS OF INTERNAL COMBUSTIONENGINES Filed July 31, 1926 altozwu b Patented Nov. 20, 1928.

rnn'nnnrox HENRY Boron, or ELMsrnAn, wEstr wirrname, NEAR cn'rcnns'rnn,

ENGLAND, AssIeNoaTo ROLLS-ROYCE LIMITED, or.

DERBY, ENGLAND.

COOLING DEVICE FOR THE CYLINDERS OF INTERNAL COMBUSTICN ENGINES.

Application filed July 31, 1926, Serial No. 126,283, and in GreatBritain September This invention has reference to cooling jackets forthe cylinders of internal combustion engines and has for its-objectbetter efficiency, more reliability, and greater facility ofconstruction than are secured by some or all of the methods ofconstruction heretofore in use. V

The invention appliestocylinders with non-detachable heads, and withmushroom In valves.

It is desirable that the water in the acket shall be spread'as far aspossible overthe whole area of the cylinder to be cooled and inparticular shall extend ascloseas possible to the valve seats, and thatwithout causing any undue lengthening of the valve ste1ns.-

According to this invention the cylinders are constructedwith shortoutwardly extending nozzles around the orifices in'the cylinder head,(preferably limited to the valve orifices) of the depth of the jacket,theijacket isconstructed' of steel or copper, with correspondingopenings, the outer faces of the nozzles and the stud bosses formed onthe cylinder andcorresponding surfaces on the inside of the jackets aretinned, and the contiguous surfaces are sweated together under pressure,and a flat'surface isleft on the jacket for making the necessary gasjoints when the cylinders are bolted to the overhead casting carryingthe bends. The skirt of the jacket is by preference welded to a flangeformed on the cylinder in well known manner.

Preferably the waterway between the cylinder jacket and the watercooling passages of the valve casing is not made through the joint butis made by means of an external U shaped tube or conduit connectingorifices in the said two j aekets.

The sparking plug is preferably located in the side of the cylinder, andthe joint between the jacket and the plug hole is pref-' erably made byan annular suitably shaped steel pressing, which is welded or otherwisesecured to and around the plug hole and to and around the orifice in thejacket. The supply connection is formed in the usual way.

An example of this invention is illustrated in the accompanyingdrawings.

Fig. 1 is a section of the cylinder on line 1-1 of Fig. 2 the camshaftand valve operating mechanism being omitted. Fig. 2 is a sectional planview on line 22 of Fig. 1 i. e. through the sweated joint between jacketand cylinder head, Fig. 3 is an external elevation of the cylinderviewed'in the direction of arrow 3, and F ig; 4 is an enlarged sectionof the "sparking plug nozzle on line H of Fig. 1, theplug itself beingin elevation.

at is a cylinder, the barrel of whiclris machined from a steel forging,-a are upstanding flanges around the valve orifices,.(four in number)formed in the head of the cylinder a are upstanding bosses constitutingextensions of the screwed stud holes and a are flanges on the cylinder0; to which the lower end of the waterjacket is welded; The faces i ofthe orifices a and bosses at? aretinned. b is the water jacket made ofpressed steel. The interiorsurface of the end of the jacket wherecontiguous with the faces of the flanges andbosses-are alsotinned andthe tinned surface of the jacket and thatof the surfaces of the faces ofthe-orifices a and of the bosses a are sweated together-under pressure.5 is a nozzle welded to-the jacket 6 for purposes hereinafter describedwith an oval flange b roundthe edge of its orifice for the purposehereinafter described. 6 is a nozzle also welded to the jacket to formthe water inlet, through which water is pumped, the water issuing from anozzle (not shown) in the casting hereinafter referred to. c is thevalve gear casing made of aluminium, constituted generally by twoplates, the bottom plate 0 being flat and the upper plate 0 being troughshaped, and having side walls with holes therethrough for the inlets andoutlets, and comprising in one casting the valve guide supports 0 thebends c and induction pipe 0 The casing 0 is secured to the cylinderhead by studs 0 and nuts 0 0 is an opening having an oval facing a forthe purposes hereinafter described, and 0 is the cover of the casing.One such casting may serve any number of cylinders as convenient. (Z arethe valves, d valve guides and d the valve springs. a is a U pipe orconnection uniting the holes or orifices b and 0 and connecting theinterior of the water jacket and of the casting, formed with flangeswhich seat on the flanges b and facing 0 and is secured thereto byscrews 6 Two ignition plugs f are provided, 9' are upstanding internallythreaded orifices formed on the cylinders, passing through orifices g inthe jacket, 9 is a hollow ex ternally and internally threaded plugconstituting the sparking plug socket, having a shoulder 9 which isscrewed into the upstanding orifice g, its shoulder g seating on theface of the upstanding orifice g, and g' is an annular member Whichafter the said plug has been screwed in, is Welded to the jacket and tothe plug there being a cavity for the cooling Water all around thehollow plug" 9 lVith the arrangement of parts as above described thecooling water is brought close to and surrounds the sparking plug holeand the valve orifices, the length of the valve stems is keptas short aspossible, the leaking of any of the joints of the Water jacket isrendered practically impossible, facility of construction is attained,and the Whole arrangen'ient is generally more efiicient thanarrangements heretofore in vogue.

\Vh'at I claim is 1. In a Water cooled internal combustion engine acylinder, a water jacket enveloping! and spaced from the top and sidesof said cylinder and having its lowered ends secured with water tightfit to said sides; the top of said cylinder and jacket being; providedwith valve and bolt receiving bos'sed apertures having their bossesextending in watertight fit against the top of said j acket a valvecasing seated on the top of said j acket and detachably fixed to saidcylinder and having cooling passages therein, and means providing apassageway for cooling liquid between said jacket and the passages insaid casing, and a spark plug socket extending into said cylinders andsecured to the Water jacket and cylinder With a Water passage from saidjacket around said socket.

2. In a Water cooled-internal combustion engine, a cylinder having aclosed top provided With valve apertures and seats, a valvecasingdetachably secured to said top, and a water jacket em lc ing" saidcylinder and extending over said top'tetweensnid head and casing! In awater cooled internal combustion engine, a cylinder having a closed topprovided \vitli valve apertures and seats,- a casing detachably securedto said top and having Water circulating passages therein; a Waterjacket extending across said top between said casing and top andarounds'aid cylinder, and conduit connecting said jacket to the passagesin said valve casing, 4. The combination with the device set forth inclaim 3; of a sparkplug socket ex: tending throiighthe saidjacket intosaid cylinder. and means for fiXing said seeketto said jacket andcylinder and providing a water passage around said socket.

In Witness whereof I have signed this specification.

' FnEDnRioK HENRY- BOYCE.

